Steam pretreatment of lignocellulosic material for enhanced enzymatic hydrolysis

Journal Article · Thu Feb 05 04:00:00 EST 1987 · Biotechnol. Bioeng.; (United States)

DOI:https://doi.org/10.1002/bit.260290213· OSTI ID:6561710

Brownell, H H; Saddler, J N

Pretreatment methods were compared with steam explosion, and differing views on the relative importance of mechanical and chemical effects were outlined. Hydrolysis was desirable; pyrolysis was undesirable. The effects of initial moisture content on steam consumption, mechanism and rate of heat transfer, pentosan solubilization, and subsequent glucose yield were summarized. The insignificant effect, after treatment at 240 degrees C, of 90% pressure bleed-down before explosion on subsequent simultaneous saccharification and fermentation (SSF) yields was described. Treatment at 190 degrees C with complete bleed-down (no explosion), when compared with that at 240 degrees C with explosion from full pressure, showed at least as good solubilization of pentosan, enzymatic hydrolysis, and SSF but showed greater pentosan destruction for the same degree of pentosan removal. Water washing of unexploded steamed aspenwood chips was at least as efficient as that of similarly treated but exploded chips. Scanning electron micrographs of unexploded chips showed extensive rupturing of vessel pit membranes and other morphological features associated with steam-exploded wood. Neither the explosion nor the high temperatures (above 190 degrees C) are necessary. 28 references.

• Research Organization: Forintek Canada Corp., Ottawa, Ontario
• OSTI ID: 6561710
• Journal Information: Biotechnol. Bioeng.; (United States), Journal Name: Biotechnol. Bioeng.; (United States) Vol. 29:2; ISSN BIBIA
• Country of Publication: United States
• Language: English

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ALDEHYDES
ASPENS
BIOCONVERSION
CARBOHYDRATES
CELLULOSE
CHEMICAL REACTIONS
DECOMPOSITION
ENERGY TRANSFER
ENZYMATIC HYDROLYSIS
FERMENTATION
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HEXOSES
HYDROLYSIS
LIGNIN
LYSIS
MOISTURE
MONOSACCHARIDES
ORGANIC COMPOUNDS
PLANTS
POLYSACCHARIDES
SACCHARIDES
SACCHARIFICATION
SOLVOLYSIS
STEAM
TREES
WOOD